Question Number 65735 by Adisco last updated on 03/Aug/19
$${show}\:{that}\:{the}\:{maping}\:{define}\:{by} \\ $$$$\left({x}\:{y}\right)=\Sigma{x}\bar {{y}} \\ $$$${is}\:{an}\:{inner}\:{product} \\ $$
show-that-the-maping-define-by-x-y-xy-is-an-inner-product-